The safe nursery room temperature was a constant worry to me with both of my babies and listening to my customers at Honeybees it still is a worry to current parents.
Traditionally you would need a light to check a thermometer strip in the room. What I love about the Gro Egg is that it actually glows a different colour depending on the temperature: blue is too cold, yellow is perfect, orange is a bit on the warm side through to red being too hot! So simple and a night light to boot!